This is a collection of resources that help you to create application software for ARM® Cortex®-M microcontrollers.
It covers various topics from getting started to debugging your
application and contains links to videos, example projects, application
notes, and documentation.

There are a lot of evaboards for STM32xxx, some boards are made in STM and others boards are from third party.Here there are a list of the STM32 MCU Eval Tools.To see the third party STM32xxx eva boards, see on google.
The NUCLEO eva boards are here.